Renaming elements in text editor does not work

[lwrage]

The AADL text editor has an operation to rename identifiers (context menu 'Rename Element' or Alt-Shift-r). This renames the identifier where it is declared but leaves all other occurrences unchanged.
child of #1371
depends on #1466

[lwrage]

Works in part with the fix for #360. Need to add renaming of package/classifier at the end of the declaration.

[Korny666]

Renaming is not working consistently.

[lwrage]

What to do about references to component implementations when the component type is renamed?

• Investigate xtext handling of qualifies name segments.
• Maybe handle when adding name at end of classifier.